ModPC’s pins complete the Male PSU power connector. When rebuilding the connectors in your system often the original metal pins cannot be reused. These pins are the optimal supplement for the connectors & couplings, and can also be used to generally replace worn-out pins.
Installation is quick and easy: the pins are simply put on a bared lead end & then fixated by compression of the holding sleeves of the pin with pliers. The installed pin can then simply be inserted into the plastic connector and will lock into place.